Wheel shell: PP. The shell mould is fixed. We suggest customer we choose our exsiting mouldings. If customer want to make something different, we need to open a new mould, which will cost time and money.

Wheel bearing: kirsite or plastic Some mouldings are for kirsite bearing, and some for plastic bearing, and some don't have bearing. If the wheels inside structure and roller are same, the wheels can change to others.Please contact with us if you have some special needs for the bearings.

Wheel material: PVC, PVCwith PU Most wheels are used in PVC. Some customer has some special requests, for example, they need total silent wheel.Please let us know in advance if you have some special requests.